package com.demo.ruiji.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.demo.ruiji.common.CustomerException;
import com.demo.ruiji.controller.ShoppingCartController;
import com.demo.ruiji.pojo.*;
import com.demo.ruiji.mapper.OrdersMapper;
import com.demo.ruiji.service.*;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.demo.ruiji.common.BaseContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * <p>
 * 订单表 服务实现类
 * </p>
 */
@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private ShoppingCartController shoppingCartController;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 订单提交（下单）
     * @param orders
     */
    @Transactional
    @Override
    public void submit(Orders orders) {
        //获取用户Id
        Long userId = BaseContext.getCurrentId();
        //根据用户Id查询所对应的购物车内容
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(userId != null, ShoppingCart::getUserId, userId);
        List<ShoppingCart> shoppingCartList = shoppingCartService.list(lambdaQueryWrapper);

        //如果订单是空就没必要下单了
        if (shoppingCartList == null||shoppingCartList.size()==0) {
            throw new CustomerException("购物车为空，不能下单");
        }

        //拿到用户数据
        User user = userService.getById(userId);

        //拿到用户的地址数据
        Long addressId = orders.getAddressBookId();
        AddressBook addressBook=addressBookService.getById(addressId);
        if (addressBook==null){
            throw new CustomerException("地址有误，不能下单");
        }

        long orderId = IdWorker.getId();  // 订单号

        //遍历购物车列表，来算一下总金额
        //  购物车中 商品 的总金额 需要保证在多线程的情况下 也是能计算正确的，故需要使用原子类
        AtomicInteger amount = new AtomicInteger(0);

        List<OrderDetail> orderDetails = shoppingCartList.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();

            orderDetail.setOrderId(orderId);
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());

            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setNumber(item.getNumber());
            orderDetail.setAmount(item.getAmount());

            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());

            return orderDetail;

        }).collect(Collectors.toList());


        //填充订单对象信息（CV的）
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额，需要 遍历购物车，计算相关金额来得到
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        // 向订单表插入数据,一条数据，插入数据之前，需要填充如上属性
        this.save(orders);    //  --> ordersService.save(orders);

        // 向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //调用接口清空购物车
        shoppingCartController.clean();
    }
}
